Index funds are the answer for most investors

https://www.bloomberg.com/news/articles/2021-05-02/warren-buffett-tech-shares-are-bargain-stock-picking-is-hard-buy-index-funds?srnd=premium-canada

"Index funds are the answer for most investors. The fact that it’s so hard to predict what kind of tremendous change there will be in the world is a great argument for diversified index funds, Buffett said.
The billionaire has advised the trustee of his will that when he passes, 90% of his bequest to his wife — now in Berkshire stock — should be in a stock index fund like the S&P 500, and 10% in Treasury bills."